Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Flows from Operating Activities
Net income	$ 43,214	$ 32,694	$ 23,818
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Provision for loan losses, net of change to FDIC receivable	14,747	2,236	14,270
Loss contingency	0	2,000	0
Provision for depreciation and amortization	3,604	3,129	2,024
Share-based compensation expense	5,237	3,368	2,014
Deferred taxes	(6,187)	2,210	(3,731)
Net amortization of investment securities premiums and discounts	821	475	3,062
Gain on sale of investment securities	(3,191)	(1,274)	(9,017)
Gain on sale of mortgages and other loans	(5,344)	(852)	(357)
Origination of loans held for sale	(18,138,339)	(20,670,866)	(13,410,485)
Proceeds from the sale of loans originated as held for sale	17,553,196	21,360,465	12,145,595
Net increase in FDIC loss sharing receivable	(2,409)	(1,610)	(3,838)
Accretion of fair value discounts	(273)	(912)	(240)
Loss on sales of other real estate owned	966	732	1,228
Valuation and other adjustments to other real estate owned	1,979	839	295
Earnings on investment in bank-owned life insurance	(3,702)	(2,482)	(1,458)
Increase in accrued interest receivable and other assets	(16,423)	(15,091)	(9,587)
Increase in accrued interest payable and other liabilities	9,606	6,974	4,346
Net Cash (Used in) Provided by Operating Activities	(542,498)	722,035	(1,242,061)
Cash Flows from Investing Activities
Purchases of investment securities available for sale	(164,940)	(542,110)	(114,049)
Proceeds from maturities, calls and principal repayments on investment securities available for sale	49,195	25,109	31,420
Proceeds from sales of investment securities available for sale	213,249	135,193	309,221
Proceeds from maturities, calls and principal repayments on investment securities held to maturity	0	0	50,968
Net (increase) decrease in loans	(1,814,196)	(1,008,410)	61,202
Purchase of loan portfolios	(309,927)	(164,033)	(63,246)
Proceeds from sale of loans held for investment	162,724	11,624	4,502
Net purchases of bank-owned life insurance	(30,465)	(45,465)	(25,465)
Net purchases of FHLB, Federal Reserve Bank, and other restricted stock	(39,578)	(12,261)	(8,345)
Reimbursements from the FDIC on loss sharing agreements	5,446	6,726	6,573
Purchases of bank premises and equipment	(1,419)	(3,894)	(2,713)
Proceeds from sales of other real estate owned	7,991	9,506	12,062
Net Cash (Used in) Provided by Investing Activities	(1,921,920)	(1,588,015)	262,130
Cash Flows from Financing Activities
Net increase in deposits	1,572,648	519,179	857,791
Net increase in short-term borrowed funds	633,500	208,500	91,000
Proceeds from long-term FHLB borrowings	265,000	35,000	49,000
Proceeds from issuance of long-term debt, net	133,142	60,336	0
Repayment of subordinated debt	(2,000)	0	0
Exercise and redemption of warrants	6	264	0
Purchase of treasury stock	0	(7,754)	0
Net proceeds from issuance of common stock	77	97,507	94,586
Net Cash Provided by Financing Activities	2,602,373	913,032	1,092,377
Net Increase in Cash and Cash Equivalents	137,955	47,052	112,446
Cash and Cash Equivalents – Beginning	233,068	186,016	73,570
Cash and Cash Equivalents – Ending	371,023	233,068	186,016
Supplementary Cash Flow Information
Interest paid	37,580	24,157	21,709
Income taxes paid	29,843	9,815	19,366
Non-cash Items:
Transfer of loans to other real estate owned	14,042	15,003	10,457
Transfer of loans from held for investment to held for sale	164,681	0	0
Transfer of loans from held for sale to held for investment	18,826
Transfer of held-to-maturity securities to available for sale			$ 268,671